[fptl] remove accidentally committed debug code

Assets/ScriptableRenderLoop/fptl/Internal-DeferredShading.shader

 	GetLightCountAndStart(start, numLights, tileIDX, nrTilesX, nrTilesY, linDepth);
 
 	float3 c = ExecuteLightList(pixCoord, start, numLights, linDepth);
-	c = OverlayHeatMap(numLights, c);
+	//c = OverlayHeatMap(numLights, c);
 	return float4(c,1.0);
 }